Summary:

• Good news is that ALSY WFSA demod is working as far as fast channels go.
• Bad news is that something is broken about LO and RF level monitors.
• Another bad news is that Daniel found that Beckhoff PC needs rebooting very soon. We asked him to do that tomorrow.

Somewhat longer story:

Yesterday LO power for two out of four channels for ALSY WFSA demod (H1:ALS-Y_WFS_A_DEMOD_LOMONCHANNEL_3 and H1:ALS-Y_WFS_A_DEMOD_LOMONCHANNEL_4) were found missing. Attached trend shows that these channels were lost on July/16 at around 7:16AM local time, shortly after the power came back from the power glitch.

Fil and Daniel went to the end station and swap the chassis but only one channel was fixed, H1:ALS-Y_WFS_A_DEMOD_LOMONCHANNEL_3 was still bad.

Today I injected RF signal to the RF in of WFSA channel 3 and confirmed that the demod signal correctly appeared in both in H1:ALS-Y_WFS_A_I3_INMON and H1:ALS-Y_WFS_A_Q3_INMON. (For comparison I also injected into ch1 and saw the same response.)

I decided to leave it alone until Tuesday, but Daniel found that Beckhoff computer is in dire need for reboot. He said it MIGHT last for the night, it might not, and when the PC crashes it will affect many things but not PSL, and the wave plate rotator will be affected but will not move on its own after a crash. Since Louis and Elenna were working on pico-ing, we decided to try our luck.

Before going home I changed the laser power back to 2W. At this point the PC still seems to be running.